As long as you have it in neutral, it shouldn't be a problem. This isn't an "automatic" transmission. The autostick is a manual gear box, driven by a torque converter that is driven through an automatic clutch. If you have the gearbox in neutral, the input side of the trasmission doesn't turn. It's no different than putting a manual transmission Beetle in neutral and towing it.
I've towed autosticks with a tow bar several times without a problem. Of course, they were all fairly short trips (25 miles or less). If I'm wrong on this, don't worry, Ret.Bugtech will be along shortly to whallop me upside the head with a rod from a Dasher . . .